#30004: Document TemporaryUploadedFile potential permission issues
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               Reporter:  Evgeny Arshinov  |          Owner:  nobody
                   Type:  Uncategorized    |         Status:  new
              Component:  Documentation    |        Version:  2.1
               Severity:  Normal           |       Keywords:
           Triage Stage:  Unreviewed       |      Has patch:  0
    Needs documentation:  0                |    Needs tests:  0
Patch needs improvement:  0                |  Easy pickings:  0
                  UI/UX:  0                |
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 Hello,

 As far as I can see, the
 [https://docs.djangoproject.com/en/2.1/topics/http/file-uploads/ File
 Uploads] documentation page does not mention any permission issues.

 What I would like to see is a warning that in absence of explicitly
 configured `FILE_UPLOAD_PERMISSIONS`, the permissions for a file uploaded
 to `FileSystemStorage` might not be consistent depending on whether a
 `MemoryUploadedFile` or a `TemporaryUploadedFile` was used for temporary
 storage of the uploaded data (which, with the default
 FILE_UPLOAD_HANDLERS, in turn depends on the uploaded data size).

 The `tempfile.NamedTemporaryFile` + `os.rename` sequence causes the
 resulting file permissions to be 0o0600 on some systems (I experience it
 here on CentOS 7.4.1708 and Python 3.6.5). In all probability, the
 implementation of Python's built-in `tempfile` module explicitly sets such
 permissions for temporary files due to security considerations.

 I found mentions of this issue [https://github.com/divio/django-
 filer/issues/1031 on GitHub], but did not manage to find any existing bug
 report in Django's bug tracker.

-- 
Ticket URL: <https://code.djangoproject.com/ticket/30004>
Django <https://code.djangoproject.com/>
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